3-32 System Manual RC.IU.B2.22 4/99.1 AKCESS
Chapter 3 - 8 Installing AKC 164SC Smart Case Controllers
AKC 164 SC
Description and
Identification The AKC 164 SC Smart Case Controller is a low voltage controller which provides either liquid-side
refrigerant flow control using a Danfoss AKV 10 or AKV 15 electronic expansion valve or suction-side
control using a Danfoss KVQ electronic evaporator pressure regulator valve. A separate power module,
PM 164 or PM 164 AS, is used to provide high voltage switching for fans, lights, anti-sweat heaters, and
defrost. There are two multi-purpose inputs (12-48 VAC or VDC) for dual-temperature case changeover
switches, box door switches, defrost termination switches, demand defrost sensors, and any switch to be
used in logic to shut down refrigeration and other controlled functions. For more information on the
logic and options for these inputs, see the section called “Using the System.”
The AKC 164 SC has connectors for four temperature sensors. One is always used for discharge air and
one for defrost termination. With AKV valves (liquid side control), one of the two remaining sensors is
used for coil inlet temperature and one for coil outlet temperature. For KVQ valves (suction side
control), the remaining two temperature sensors can be used for additional discharge air streams or for
other temperatures.
There is also a connector for a drain sensor.
Since they are nodes on the I/O network, AKC 164’s communicate with a host AKC 55 over TP-78K
twisted pair shielded cable.
The controller’s name and code number are printed on the label as shown at left below:
AKC 164 SC
Mounting There are two standard mounting techniques for Smart Case Controllers. They may be snaptrack
mounted or secured with screws using the mounting holes on the enclosure. Both methods are illus-
trated below.
Snaptrack
Mounting
Screw
Mounting
AKCESS System Manual RC.IU.B2.22 4/99.1 3-33
Addressing
Smart Case Each Smart Case Controller connected to an AKC 55 must have a unique address in the
Controllers range 01-99. The address is set by the two rotary switches located side-by-side beneath the waterproof
plug shown in the following illustration. Each switch has an arrow pointer which serves also as a
screwdriver slot. Use a small screwdriver to rotate the arrowhead on each switch until the left arrowhead
points to the first digit, and the right arrowhead to the second digit, of the correct address. You must
interrupt and restore power to the Smart Case Controller for the new address to take effect.
Network Connections
for AKC 164 Smart
Case Controllers
To connect the AKC 164 to the I/O network, first splice a 4-pin bus connector cable (part number 95-
03CC164) to the main I/O run from the AKC 55 Rack Controller. (The cable is two feet long.) Then
plug the connector into the AKC 164 where indicated by the arrow printed on top which reads “From
Rack Controller.” There is no polarity requirement for the A & B leads. If this is the last I/O node on a
main cable run, connect a terminator across network wires A & B.
Please remember
to replace the
rubber plug after
setting the
address ! !
3-34 System Manual RC.IU.B2.22 4/99.1 AKCESS
Sensor Connections
to AKC 164 Smart
Case Controllers
Connect sensors by plugging them into the AKC 164 where indicated by the labeled arrows on top of
the AKC 164. AKS 11 sensors for AKC 164 SC Smart Case Controllers have Molex-type plugs.
How to Mount
Temperature Sensors Each sensor is supplied with two straps for fastening. For pipe-mounted sensors, one strap is used for
fastening the sensor element, and the second is used for cable relief.
Pipe-mounted sensors should be positioned at two o’clock or ten o’clock, and MUST be insulated.
Be careful to order
the right sensors ! !
AKC 164's only use
sensors with
MOLEX-type plugs !!
Be sure to properly
insulate all pipe-
mounted
temperature
sensors !
AKCESS System Manual RC.IU.B2.22 4/99.1.1 3-35
Labeling Temperature
Sensors AKS sensors are supplied with color-coded stickers for marking. Danfoss highly recommends that the
stickers be used to make connection and service work easier.
Temperature Sensor
Mounting Locations:
Liquid-side Control The illustration below shows the locations for mounting the four temperature sensors.
Liquid In sensor If the coil is shorter than 6½ feet (approximately 2 m.), then the
liquid in sensor should be located at the first loop opposite the
inlet. If the coil is longer than 6½ feet, then the liquid in sensor
should be located at the inlet.
Location of the liquid in sensor is critical to correct superheat measurement.
Gas Out sensor At the outlet of the evaporator coil.
Case/Box sensor For cases, in the primary discharge air stream. For boxes, in the
return air stream.
Defrost Sensor On the evaporator coil, or where the OEM normally places the
defrost termination sensor.
These quick little
labels really help
make service
easier! Take time
to put them on
now !!
3-36 System Manual RC.IU.B2.22 4/99.1.1 AKCESS
AKV 10 or AKV 15
Valve Connection The AKV 10 or AKV 15 electronic expansion valve, which must have a 24 VAC coil, connects directly
to the valve leads (there is no polarity to observe) from the AKC 164 SC Smart Case Controller, using
the 4-pin connector on the 10-pin cable. The controller MUST be powered for the valve to operate.
If extension of the valve coil leads is necessary, use only 18 AWG stranded wire.
Drain Sensor
Location & Mounting The drain sensor should be mounted approximately two to four inches from the drain opening. For best
results, the sensor should be positioned as shown in the illustration. Use the attached adhesive tape to
secure the sensor to the drain pan.
Keep your insta
ll
ation
safe ! Carefully
insulate any control
relay wires you didnt
use !!
Use wire nuts to
connect the coil leads
to the Smart Case
Controller! Theres no
p
olarity re
q
uirement !!
AKCESS System Manual RC.IU.B2.22 4/99.1 3-37
Temperature Sensor
Mounting Locations:
Suction-side Control Defrost Termination Sensor On the evaporator coil, or where the OEM normally
places the defrost termination sensor.
Discharge Air Sensor(s) In the primary discharge air stream.
Drain Sensor See the drawing on the preceding page.
It is a good general rule to place the sensors in the same locations the case manufacturer uses for sensors
with the same purpose.
3-38 System Manual RC.IU.B2.22 4/99.1 AKCESS
Power Module
Connection The PM 164 Power Module is connected to the AKC 164 Smart Case Controller using a Danfoss 8-pin
control circuit connector cable, which is available in 4-foot and 12-foot lengths. On the AKC 164, the
cable connection is indicated by an arrow labeled “From Power Module;” the connector on the power
module, in accordance with CRMA standards, is in the bottom of the module. When installed in the case
it is positioned over a knock-out.
Controlled Load
Connections — Lights,
Fans, and Anti-sweats Lights, fans, and anti-sweat heater circuits are connected to the load block on the AKC 164 Smart Case
Controller as shown in the following illustration:
Maximum load rating for these connections is 20 amps (total) with the bus bars in place. For load ratings
when bus bars are cut or removed, see the PM164 instruction sheet.
AKCESS System Manual RC.IU.B2.22 4/99.1 3-39
Defrost Module
Connection There are two types of Defrost Module. The DF 164 has one 30 Amp connection for an electric defrost
load and one 3 Amp connection for a reverse air fan load; the DF 164-1 has two 30 Amp connections for
electric defrost loads.
Either type of defrost module is connected to the AKC 164 Smart Case Controller using the two-pin
connector cable which is supplied attached to the defrost module. The connector is plugged into the end
of the Power module where indicated by the arrow on top labeled “Connector to Defrost Module.”
Controlled Load
Connection — Defrost Connections for electric defrost and for reverse air fans (if present) are made to the DF 164 or DF 164-1
Defrost Module as shown in the following illustration:
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AKCESS System Manual RC.IU.B2.22 4/99.1 3-41
KVQ Valve
and Multi-Purpose
Input Connections A 10-pin valve control cable (part number 95-10AKC164) provides connection from the AKC 164 to a
Danfoss KVQ electronic evaporator pressure regulating valve. (The cable is 4 feet long.) Only four
conductors are used for connection to the KVQ valve. The other conductors are for switch inputs which
are used for a variety of purposes, such as box door switches, demand defrost sensors, dual temperature
case switches, fixture shutdown switches, or defrost termination switches. The valve and switch inputs
are connected as shown in the following illustration:
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AKC 164 Power
Connections Power for the AKC 164 Smart Case Controller is 24 VAC (60 Hz) and is supplied by a connection (8-
pin cable) to the PM 164 Power Module.
Maximum circuit overload protection is 20 amps. Mains line and neutral are connected as shown if a
single 20 amp circuit is to be used for all devices. If separate circuits are required for fans, anti-sweat
heaters, or both, the bus bars must be cut or removed as needed.
Inspection of the
Installed AKC 164 When an AKC 164 SC Smart Case Controller is ready for operation, you should be able to observe the
following:
1. Power connections (120 VAC) have been made to the PM 164 Power Module. The bus bars are
positioned, cut, or removed as necessary.
2. The address switches have been set to a valid address.
3. Sensors are tagged with the supplied color-coded tags; are in the corresponding proper locations; are
insulated if pipe-mounted; and are connected to the AKC 164 where indicated by the arrows printed
on top of the Smart Case Controller.
4. Interconnecting cables are in place between the Smart Case Controller and the Power Module, and
between the Power Module and the Defrost Module (if used).
5. Loads are connected to the Power Module and Defrost Module (if used).
6. The valve cable is connected to the Smart Case Controller with a 10-pin valve control cable, and
cables from external switches (if used) are spliced to their dedicated conductor leads in the valve
control cable.
7. Unused leads have been securely insulated.
8. I/O network connection has been made by splicing the red and black signal wires and their shield to
an I/O cable run connected to an AKC 55.
9. If this controller is the last node on a main run, make sure that it is terminated by using one of the
terminators supplied with the AKC 55.
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